alamb opened a new issue, #12552:
URL: https://github.com/apache/datafusion/issues/12552

   ### Is your feature request related to a problem or challenge?
   
   Part of https://github.com/apache/datafusion/issues/12550
   
   While working on https://github.com/datafusion-contrib/datafusion-dft I want 
to register various types of extensions while configuring the SessionContext, 
ideally adding each extension to the 
[`SessionStateBuilder`](https://docs.rs/datafusion/latest/datafusion/execution/session_state/struct.SessionStateBuilder.html)
 each time. 
   
   However, I found that there were a few APIs missing on SessionStateBuilder 
so I had to implement my own workaround builder here: 
https://github.com/datafusion-contrib/datafusion-dft/blob/8247555f9464058c1ac3370196739ac2b19343ee/src/extensions/builder.rs#L84-L98
   
   
[`SessionStateBuilder`](https://docs.rs/datafusion/latest/datafusion/execution/session_state/struct.SessionStateBuilder.html)
 has 
[`SessionStateBuilder::with_table_factories`](https://docs.rs/datafusion/latest/datafusion/execution/session_state/struct.SessionStateBuilder.html#method.with_table_factories)
 method to set *all* the table factories, but no way to just append a new table 
factory
   
   ### Describe the solution you'd like
   
   I would like a way to append just a single new `TableFactory` to the list of 
factories being constructed
   
   Also it should have 
   1. Documentation
   2. Tests (ideally a doc test with an example of how to use to use it)
   
   ### Describe alternatives you've considered
   
   I recommend adding a new function `SessionStateBuilder::with_table_factory` 
that works like this:
   
   ```rust
   let state = SessionStateBuilder::new() 
     .with_table_factory("DELTA", factory1)
     .wth_table_facotry("ICEBERG", facotry2)
     // resulting state has both factory1 and factory2
     .build()
   ```
   
   ### Additional context
   
   _No response_


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